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Universal Modder with Claude Code

Updated 2026-10-13

Claude Code is the agent Universal Modder was built around; the repo’s tagline is “Point Claude at any game.” Setup is two slash commands inside Claude Code.

Set up in Claude Code

Add the marketplace
In Claude Code, run /plugin marketplace add rehan-remade/universal-modder.
Install the plugin
/plugin install universal-modder@universal-modder.
Set your fal key (optional)
Export FAL_KEY in the shell before starting Claude Code so the bundled fal MCP server can use it.
Check the CLI
Ask Claude to run um scan. If the command is missing, install it with uv tool install git+https://github.com/rehan-remade/universal-modder.
Give it a mission
Name a single-player game you own and one small change. Claude follows the mod-any-game skill from there.

Skills the plugin adds

Skill	What Claude uses it for
`mod-any-game`	The full workflow, safety rules and engine playbooks
`game-recon`	Engine, version, anti-cheat, loaders, save folders, ranked routes
`game-research-websearch`	Open-web research, including archives and mod-site APIs
`reverse-engineering`	Decompilers, debuggers and file-format work
`fal-assets`	Sprites, textures, PBR maps, 3D models, rigging, audio and video via fal
`asset-pipeline`	Turning art into engine-ready frames and sprite sheets
`game-automation`	Launching, screenshots, input and in-game agent bridges
`showcase-video`	Recording and cutting showcase videos
`mashup-mods`	Games inside games, passthrough mods and reimplementations
`publish-mod`	Linting, packaging, credits and posts
`port-a-mod`	Porting mods to newer versions or loaders
`share-field-notes`	Searching the knowledge base and opening PRs with new notes

Prompts that work well as a start

“Scan my library and tell me which games look easiest to mod, and why.”
“Inspect Terraria. Report the version, engine, modding route, save location and any anti-cheat concerns. Do not change any files yet.”
“Back up my saves, then add one new weapon. Stop after it loads in game and show me a screenshot.”

The first two mirror the plan-before-editing step recommended in published guides. Keep the first mission small: the workflow is designed around one working slice before expanding.

What Claude will refuse

The safety rules ship with the skills, so Claude Code should decline to inject into online games with anti-cheat, write cheats against other players, or bypass anti-cheat, DRM or ownership checks. It should also ask before driving your input, installing loaders into game folders, or publishing.

FAQ

Does Universal Modder work in the Claude chat app?

It is built for coding agents that can run commands on your PC, such as Claude Code. Support for the Claude chat app is not stated in the README.

Which Claude model or plan do I need?

The project does not specify one. You need whatever your Claude Code setup already uses; long modding sessions will consume more usage than a typical coding task.

Is Universal Modder made by Anthropic?

No. It is a community project under the rehan-remade GitHub account and is not affiliated with Anthropic.

Can I use Codex or Gemini CLI instead?

Yes. See the install commands for every agent.

Unofficial, independent guide. Not affiliated with the Universal Modder project, its maintainers (rehan-remade), fal, Anthropic or any game publisher. The official source is github.com/rehan-remade/universal-modder. We do not host game files, mods or decompiled code. Only mod games you own.